noun 1. Rocketry. a projected type of propulsion for vehicles in outer space, the exhaust consisting of positive ions and negative electrons repelled from the vehicle by electrostatic forces, resulting in a very high exhaust velocity.

[ahy-on-tuh-fuh-ree-sis] /aɪˌɒn tə fəˈri sɪs/ noun 1. a painless alternative to drug injection in which a weak electrical current is used to stimulate drug-carrying ions to pass through intact skin. /aɪˌɒntəʊfəˈriːsɪs/ noun 1. (biochem) a technique for studying neurotransmitters in the brain by the application of experimental solutions to the tissues through fine glass electrodes […]

noun, Physics. 1. any device used to prevent ions in an electron beam from striking other apparatus, especially in mass spectrometry. ion trap A device, such as a magnet, used to prevent ions in an electron beam from striking another apparatus, such as a cathode-ray tube screen, which could cause it to lose luminescence.

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